discourse/app/models/topic_user.rb

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class TopicUser < ActiveRecord::Base
belongs_to :user
belongs_to :topic
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# Class methods
class << self
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# Enums
def notification_levels
@notification_levels ||= Enum.new(:muted, :regular, :tracking, :watching, start: 0)
end
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def notification_reasons
@notification_reasons ||= Enum.new(:created_topic, :user_changed, :user_interacted, :created_post)
end
def auto_track(user_id, topic_id, reason)
if TopicUser.where(user_id: user_id, topic_id: topic_id, notifications_reason_id: nil).exists?
change(user_id, topic_id,
notification_level: notification_levels[:tracking],
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notifications_reason_id: reason
)
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MessageBus.publish("/topic/#{topic_id}", {
notification_level_change: notification_levels[:tracking],
notifications_reason_id: reason
}, user_ids: [user_id])
end
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end
# Find the information specific to a user in a forum topic
def lookup_for(user, topics)
# If the user isn't logged in, there's no last read posts
return {} if user.blank? || topics.blank?
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topic_ids = topics.map(&:id)
create_lookup(TopicUser.where(topic_id: topic_ids, user_id: user.id))
end
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def create_lookup(topic_users)
topic_users = topic_users.to_a
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result = {}
return result if topic_users.blank?
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topic_users.each do |ftu|
result[ftu.topic_id] = ftu
end
result
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end
def get(topic,user)
topic = topic.id if Topic === topic
user = user.id if User === user
TopicUser.where('topic_id = ? and user_id = ?', topic, user).first
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end
# Change attributes for a user (creates a record when none is present). First it tries an update
# since there's more likely to be an existing record than not. If the update returns 0 rows affected
# it then creates the row instead.
def change(user_id, topic_id, attrs)
# Sometimes people pass objs instead of the ids. We can handle that.
topic_id = topic_id.id if topic_id.is_a?(Topic)
user_id = user_id.id if user_id.is_a?(User)
TopicUser.transaction do
attrs = attrs.dup
attrs[:starred_at] = DateTime.now if attrs[:starred_at].nil? && attrs[:starred]
if attrs[:notification_level]
attrs[:notifications_changed_at] ||= DateTime.now
attrs[:notifications_reason_id] ||= TopicUser.notification_reasons[:user_changed]
end
attrs_array = attrs.to_a
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attrs_sql = attrs_array.map { |t| "#{t[0]} = ?" }.join(", ")
vals = attrs_array.map { |t| t[1] }
rows = TopicUser.update_all([attrs_sql, *vals], topic_id: topic_id.to_i, user_id: user_id)
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if rows == 0
now = DateTime.now
auto_track_after = User.select(:auto_track_topics_after_msecs).where(id: user_id).first.auto_track_topics_after_msecs
auto_track_after ||= SiteSetting.auto_track_topics_after
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if auto_track_after >= 0 && auto_track_after <= (attrs[:total_msecs_viewed] || 0)
attrs[:notification_level] ||= notification_levels[:tracking]
end
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TopicUser.create(attrs.merge!(user_id: user_id, topic_id: topic_id.to_i, first_visited_at: now ,last_visited_at: now))
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end
end
rescue ActiveRecord::RecordNotUnique
# In case of a race condition to insert, do nothing
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end
def track_visit!(topic,user)
now = DateTime.now
rows = TopicUser.update_all({last_visited_at: now}, {topic_id: topic.id, user_id: user.id})
if rows == 0
TopicUser.create(topic_id: topic.id, user_id: user.id, last_visited_at: now, first_visited_at: now)
end
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end
# Update the last read and the last seen post count, but only if it doesn't exist.
# This would be a lot easier if psql supported some kind of upsert
def update_last_read(user, topic_id, post_number, msecs)
return if post_number.blank?
msecs = 0 if msecs.to_i < 0
args = {
user_id: user.id,
topic_id: topic_id,
post_number: post_number,
now: DateTime.now,
msecs: msecs,
tracking: notification_levels[:tracking],
threshold: SiteSetting.auto_track_topics_after
}
rows = exec_sql("UPDATE topic_users
SET
last_read_post_number = greatest(:post_number, tu.last_read_post_number),
seen_post_count = t.highest_post_number,
total_msecs_viewed = tu.total_msecs_viewed + :msecs,
notification_level =
case when tu.notifications_reason_id is null and (tu.total_msecs_viewed + :msecs) >
coalesce(u.auto_track_topics_after_msecs,:threshold) and
coalesce(u.auto_track_topics_after_msecs, :threshold) >= 0 then
:tracking
else
tu.notification_level
end
FROM topic_users tu
join topics t on t.id = tu.topic_id
join users u on u.id = :user_id
WHERE
tu.topic_id = topic_users.topic_id AND
tu.user_id = topic_users.user_id AND
tu.topic_id = :topic_id AND
tu.user_id = :user_id
RETURNING
topic_users.notification_level, tu.notification_level old_level
",
args).values
if rows.length == 1
before = rows[0][1].to_i
after = rows[0][0].to_i
if before != after
MessageBus.publish("/topic/#{topic_id}", {notification_level_change: after}, user_ids: [user.id])
end
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end
if rows.length == 0
args[:tracking] = notification_levels[:tracking]
args[:regular] = notification_levels[:regular]
args[:site_setting] = SiteSetting.auto_track_topics_after
exec_sql("INSERT INTO topic_users (user_id, topic_id, last_read_post_number, seen_post_count, last_visited_at, first_visited_at, notification_level)
SELECT :user_id, :topic_id, :post_number, ft.highest_post_number, :now, :now,
case when coalesce(u.auto_track_topics_after_msecs, :site_setting) = 0 then :tracking else :regular end
FROM topics AS ft
JOIN users u on u.id = :user_id
WHERE ft.id = :topic_id
AND NOT EXISTS(SELECT 1
FROM topic_users AS ftu
WHERE ftu.user_id = :user_id and ftu.topic_id = :topic_id)",
args)
end
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end
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end
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end